diff options
Diffstat (limited to 'gdb/hppa-tdep.c')
| -rw-r--r-- | gdb/hppa-tdep.c | 206 |
1 files changed, 205 insertions, 1 deletions
diff --git a/gdb/hppa-tdep.c b/gdb/hppa-tdep.c index fa44b12..f8162e8 100644 --- a/gdb/hppa-tdep.c +++ b/gdb/hppa-tdep.c @@ -68,6 +68,13 @@ static int inst_saves_gr PARAMS ((unsigned long)); static int inst_saves_fr PARAMS ((unsigned long)); static int pc_in_interrupt_handler PARAMS ((CORE_ADDR)); static int pc_in_linker_stub PARAMS ((CORE_ADDR)); +static int compare_unwind_entries PARAMS ((struct unwind_table_entry *, + struct unwind_table_entry *)); +static void read_unwind_info PARAMS ((struct objfile *)); +static void internalize_unwinds PARAMS ((struct objfile *, + struct unwind_table_entry *, + asection *, unsigned int, + unsigned int, unsigned int *)); /* Routines to extract various sized constants out of hppa @@ -248,6 +255,200 @@ extract_17 (word) (word & 0x1) << 16, 17) << 2; } + +/* Compare the start address for two unwind entries returning 1 if + the first address is larger than the second, -1 if the second is + larger than the first, and zero if they are equal. */ + +static int +compare_unwind_entries (a, b) + struct unwind_table_entry *a; + struct unwind_table_entry *b; +{ + if (a->region_start > b->region_start) + return 1; + else if (a->region_start < b->region_start) + return -1; + else + return 0; +} + +static void +internalize_unwinds (objfile, table, section, entries, size, indexp) + struct objfile *objfile; + struct unwind_table_entry *table; + asection *section; + unsigned int entries, size; + unsigned int *indexp; +{ + /* We will read the unwind entries into temporary memory, then + fill in the actual unwind table. */ + if (size > 0) + { + unsigned long tmp; + unsigned i; + char *buf = alloca (size); + + bfd_get_section_contents (objfile->obfd, section, buf, 0, size); + + /* Now internalize the information being careful to handle host/target + endian issues. */ + for (i = 0; i < entries; i++) + { + table[i].region_start = bfd_get_32 (objfile->obfd, + (bfd_byte *)buf); + buf += 4; + table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *)buf); + buf += 4; + tmp = bfd_get_32 (objfile->obfd, (bfd_byte *)buf); + buf += 4; + table[i].Cannot_unwind = (tmp >> 31) & 0x1;; + table[i].Millicode = (tmp >> 30) & 0x1; + table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1; + table[i].Region_description = (tmp >> 27) & 0x3; + table[i].reserved1 = (tmp >> 26) & 0x1; + table[i].Entry_SR = (tmp >> 25) & 0x1; + table[i].Entry_FR = (tmp >> 21) & 0xf; + table[i].Entry_GR = (tmp >> 16) & 0x1f; + table[i].Args_stored = (tmp >> 15) & 0x1; + table[i].Variable_Frame = (tmp >> 14) & 0x1; + table[i].Separate_Package_Body = (tmp >> 13) & 0x1; + table[i].Frame_Extension_Millicode = (tmp >> 12 ) & 0x1; + table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1; + table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1; + table[i].Ada_Region = (tmp >> 9) & 0x1; + table[i].reserved2 = (tmp >> 5) & 0xf; + table[i].Save_SP = (tmp >> 4) & 0x1; + table[i].Save_RP = (tmp >> 3) & 0x1; + table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1; + table[i].extn_ptr_defined = (tmp >> 1) & 0x1; + table[i].Cleanup_defined = tmp & 0x1; + tmp = bfd_get_32 (objfile->obfd, (bfd_byte *)buf); + buf += 4; + table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1; + table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1; + table[i].Large_frame = (tmp >> 29) & 0x1; + table[i].reserved4 = (tmp >> 27) & 0x3; + table[i].Total_frame_size = tmp & 0x7ffffff; + } + } +} + +/* Read in the backtrace information stored in the `$UNWIND_START$' section of + the object file. This info is used mainly by find_unwind_entry() to find + out the stack frame size and frame pointer used by procedures. We put + everything on the psymbol obstack in the objfile so that it automatically + gets freed when the objfile is destroyed. */ + +void +read_unwind_info (objfile) + struct objfile *objfile; +{ + asection *unwind_sec, *elf_unwind_sec, *stub_unwind_sec; + unsigned unwind_size, elf_unwind_size, stub_unwind_size, total_size; + unsigned index, unwind_entries, elf_unwind_entries; + unsigned stub_entries, total_entries; + struct obj_unwind_info *ui; + + ui = obstack_alloc (&objfile->psymbol_obstack, + sizeof (struct obj_unwind_info)); + + ui->table = NULL; + ui->cache = NULL; + ui->last = -1; + + /* Get hooks to all unwind sections. Note there is no linker-stub unwind + section in ELF at the moment. */ + unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_START$"); + elf_unwind_sec = bfd_get_section_by_name (objfile->obfd, ".hppa_unwind"); + stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$"); + + /* Get sizes and unwind counts for all sections. */ + if (unwind_sec) + { + unwind_size = bfd_section_size (objfile->obfd, unwind_sec); + unwind_entries = unwind_size / UNWIND_ENTRY_SIZE; + } + else + { + unwind_size = 0; + unwind_entries = 0; + } + + if (elf_unwind_sec) + { + elf_unwind_size = bfd_section_size (objfile->obfd, elf_unwind_sec); + elf_unwind_entries = elf_unwind_size / UNWIND_ENTRY_SIZE; + } + + if (stub_unwind_sec) + { + stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec); + stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE; + } + else + { + stub_unwind_size = 0; + stub_entries = 0; + } + + /* Compute total number of unwind entries and their total size. */ + total_entries = unwind_entries + elf_unwind_entries + stub_entries; + total_size = total_entries * sizeof (struct unwind_table_entry); + + /* Allocate memory for the unwind table. */ + ui->table = obstack_alloc (&objfile->psymbol_obstack, total_size); + ui->last = total_entries - 1; + + /* Internalize the standard unwind entries. */ + index = 0; + internalize_unwinds (objfile, &ui->table[index], unwind_sec, + unwind_entries, unwind_size); + index += unwind_entries; + internalize_unwinds (objfile, &ui->table[index], elf_unwind_sec, + elf_unwind_entries, elf_unwind_size); + index += elf_unwind_entries; + + /* Now internalize the stub unwind entries. */ + if (stub_unwind_size > 0) + { + unsigned int i; + char *buf = alloca (stub_unwind_size); + + /* Read in the stub unwind entries. */ + bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf, + 0, stub_unwind_size); + + /* Now convert them into regular unwind entries. */ + for (i = 0; i < stub_entries; i++, index++) + { + /* Clear out the next unwind entry. */ + memset (&ui->table[index], 0, sizeof (struct unwind_table_entry)); + + /* Convert offset & size into region_start and region_end. + Stuff away the stub type into "reserved" fields. */ + ui->table[index].region_start = bfd_get_32 (objfile->obfd, + (bfd_byte *) buf); + buf += 4; + ui->table[index].stub_type = bfd_get_8 (objfile->obfd, + (bfd_byte *) buf); + buf += 2; + ui->table[index].region_end + = ui->table[index].region_start + 4 * + (bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1); + buf += 2; + } + + } + + /* Unwind table needs to be kept sorted. */ + qsort (ui->table, total_entries, sizeof (struct unwind_table_entry), + compare_unwind_entries); + + /* Keep a pointer to the unwind information. */ + objfile->obj_private = (PTR) ui; +} + /* Lookup the unwind (stack backtrace) info for the given PC. We search all of the objfiles seeking the unwind table entry for this PC. Each objfile contains a sorted list of struct unwind_table_entry. Since we do a binary @@ -267,7 +468,10 @@ find_unwind_entry(pc) ui = OBJ_UNWIND_INFO (objfile); if (!ui) - continue; + { + read_unwind_info (objfile); + ui = OBJ_UNWIND_INFO (objfile); + } /* First, check the cache */ |